Portable generators

ABSTRACT

A customizable portable generator system and methods for assembling the same are disclosed. In one example, the generator system generally includes a universal frame including a plurality of mounting interfaces configured for detachably attaching one of a plurality of different engines and a plurality of wheel assemblies and/or support legs. Optionally, at least one handlebar assembly may be detachably mounted on the frame in at least one of two possible positions. In one example, the handlebar may be pivotably mounted to the frame. The frame components may be assembled into a kit from which a user may select various options to custom configure the generator unit. Other appurtenances and accessories may be provided which interface with the generator unit and frame. A modular generator frame and compressed gas-fueled generators are also disclosed.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation of U.S. patent applicationSer. No. 14/169,739 filed Jan. 31, 2014, which claims the benefit ofU.S. Provisional Patent Application Ser. No. US 61/760,054 filed Feb. 2,2013, which are all hereby incorporated herein by reference in theirentireties.

BACKGROUND OF THE INVENTION

The invention generally relates to engine-generator sets, for producingelectric power, and more particularly to a highly customizable portableelectric generators.

Portable electric generators produce a ready source of electricity foruse in a variety of situations where electricity may not be availablefrom the conventional power grid. Such situations may include poweroutages, remote locations without access to a nearby source of powerfrom an electric utility, constructions sites, and instances wheretemporary power hookups from the utility are not practical or convenientfor short periods of time.

A customizable portable generator system is desirable.

SUMMARY OF THE INVENTION

A portable generator system is disclosed that is configurable by a userand which may be assembled at the point of sale or later reconfiguredafterwards to address changing needs. The portable generator system mayinclude a versatile universal support frame that provides an opportunityfor a user to select different sizes/types of engines and accessorieswhich are conveniently interchangeable with a single frame. This may beaccomplished through a generator frame that provides common accessoryequipment interfaces adapted to accept a variety of accessories and/orreadily alter the mounting arrangement of such accessories to vary thefunctionality of the portable generator system created by the user'spreferences.

A universal frame generator system may include a universal enginemounting system that allows a plurality of engines having at least onedifferent characteristic (e.g. KW electrical output capacity, fuel type,auxiliary equipment/accessories, etc.) to be interchangeably mounted toa single configuration and size generator frame via a common enginemounting interface.

A universal frame generator system may further include floor supportsystem configured to mount different type floor supports includingpedestal type legs and/or wheel assemblies at different locations whichare detachably mounted to the frame via a common mounting systeminterface.

A universal frame generator system may further include a handlebarmounting system that is configurable to mount different sizes and typesof handlebars in a plurality of different orientations.

A universal frame generator system may further include a power cordmanagement system that is configurable to provide a variety of cordsupport arrangements.

In some example systems, the foregoing frame, engines, accessories, andother appurtenances disclosed herein may be assembled into a kit whichpresents custom options selectable by a user to equip the generator unitas desired. The kit can be shipped to a distributor or retailer whichincludes all the components necessary to assemble and create a fullyfunctional generator unit that has been customized at the point of saleto meet the user's preferences. In one example, a generator unitassembly kit includes a universal frame, a plurality of engines havingat least one different characteristic, a plurality of wheel assemblies,a plurality of frame support legs, and a plurality of handlebars.

An exemplary method for assembling a generator unit may include a userselecting an engine, at least two of a wheel assembly, pair of supportlegs, or combinations thereof from a generator kit, and mounting theforegoing components selected on the frame. The method may furtherinclude selecting at least one pair of handlebars and mounting thehandlebars to the frame in at least one of two positions. In oneexample, the positions include a horizontal position and a verticalposition.

The present application further discloses additional kits, accessories,and appurtenances which interface with and may be mountable on thegenerator and/or support frame disclosed herein.

The present application further discloses a portable generator withmodular frame system. The frame system may generally include a pluralityof corner members and connector plates which may be interconnected tocollectively form an open space frame configured for supporting aninternal combustion engine, related appurtenances, and accessories. Thepresent application further discloses compact gaseous fuel powergenerators which may be operated from compressed liquid fuel canistersor cylinders. In one non-limiting example, the gaseous fuel may bepropane.

BRIEF DESCRIPTION OF THE DRAWINGS

The features of some non-limiting examples will be described withreference to the following drawings, where like elements are labeledsimilarly, and in which:

FIGS. 1-7 show various views of one example of a portable generator andsupport frame;

FIGS. 8-14A show various views of the generator and frame of FIGS. 1-7with essentially all engine-related components removed except for thefuel tank to clearly show the frame;

FIG. 14B is a detail of the frame with handlebar attachment taken fromFIG. 14A;

FIG. 15 is a cross-sectional view of a wheel assembly and the frame;

FIG. 16 A is a longitudinal cross-sectional view of a support legassembly and the frame;

FIG. 16B is a transverse cross-sectional view from FIG. 16A;

FIGS. 17, 18A, and 18B show a power cord management system and a detailthereof respectively;

FIG. 19A shows a lifting member for transporting the generator;

FIG. 19B is a detail of the frame with the handlebar assembly mountingarrangement taken from FIG. 19A;

FIGS. 19C-F show various examples of the handlebar and wheelassembly/support leg mounting options and positions;

FIG. 20A is a perspective view of the handlebar assembly mountable tothe frame;

FIG. 20B is an exploded detail view from FIG. 20A of the handlebarmounting clamp and position adjustment assembly and interface with theframe;

FIG. 21 is an exploded view of the handlebar assembly of FIG. 20A;

FIG. 22 is an exploded view of the wheel assembly and mounting interfacewith the frame;

FIG. 23 is an exploded view of the support leg and mounting interfacewith the frame;

FIGS. 24 and 25 are rear and front perspective views respectively of analternative configuration of the generator frame, showing a U-shapedpivotable/foldable front handlebar, alternative pivotable/foldable rearhandlebars, and a laterally extending lifting bar attached to a top ofthe generator frame;

FIG. 25A is a detail from FIG. 25 showing the pivotable front handlebarmounting assembly for a U-shaped handlebar;

FIG. 26 is a bottom rear perspective view of the alternative generatorframe;

FIG. 26A is a detail from FIG. 26 showing the pivotable front handlebarmounting assembly for the U-shaped handlebar;

FIG. 26B is a detail from FIG. 26 showing the alternative pivotable rearhandlebar mounting assembly;

FIG. 26C is a detail from FIG. 26 showing the mounting assembly for thelifting bar attached to the top of the generator frame;

FIGS. 27 and 28 show rear and front elevation views of the alternativegenerator frame;

FIG. 29 is a side elevation view showing the U-shaped handlebar in thedeployed operating position in dashed lines;

FIG. 30 is a top plan view showing the lifting bar and the U-shapedhandlebar in the stowed position nested in the top of the generatorframe;

FIG. 31 is an elevation view of an engine maintenance reminder systemcontrol panel usable with the generator;

FIG. 32 is an elevation view of an alternative configuration of a enginemaintenance reminder system control panel;

FIG. 33 is a top perspective view of a portable generator with modularframe design constructed of corner members and connector plates;

FIG. 34 is a first side elevation view thereof;

FIG. 35 is a second side elevation view thereof of the side opposite thefirst side;

FIG. 36 is a third side elevation view thereof showing the controlpanel;

FIG. 37 is fourth side elevation view thereof of the side opposite thethird side and showing the engine;

FIG. 38 is top plan view thereof;

FIG. 39 is a bottom plan view thereof;

FIG. 40 is a bottom perspective view thereof;

FIG. 41 is top perspective view of the modular frame design showing onlythe frame for clarity;

FIGS. 42-45 are side elevation views thereof;

FIG. 46 is a top plan view thereof;

FIG. 47 is a bottom plan view thereof;

FIG. 48 is a top corner perspective view thereof looking downwardsthrough a top corner to a diagonal bottom corner;

FIG. 49 is a top corner perspective view thereof looking downwardsthrough a different top corner to a diagonal bottom corner;

FIG. 50 is a bottom corner perspective view thereof looking upwardsthrough a bottom corner to a diagonal top corner;

FIGS. 51-58 are various views showing a connector plate of the modulargenerator frame used to couple corner members together;

FIGS. 59-63 are various views showing the corner members;

FIG. 64 shows an assembled pair of connector plates positioned on amounting tang of a corner member;

FIG. 65 is an exploded view of the corner member mounting tang andconnector plate assembly including an accessory clip;

FIG. 66 is a partially assembled perspective view of two corner membersbeing joined together by the mounting tangs via a pair of connectorplates;

FIG. 67 is a top plan view of the permanent fuel tank of the portablegenerator with modular generator frame of FIG. 33;

FIGS. 68-71 are side elevation views thereof;

FIG. 72 is a top plan view thereof;

FIG. 73 is a bottom plan view thereof;

FIGS. 74-81 show various views of the permanent fuel tank mounted in themodular generator frame;

FIG. 82 is an exploded view showing a removable portable fuel tankinsertably mountable into the top of the permanent fuel tank;

FIG. 83 is a top perspective view of the portable fuel tank of FIG. 82;

FIG. 84 is a bottom perspective view thereof showing the fluid outletcoupling for fluid connection to the permanent fuel tank;

FIG. 85 is a top plan view thereof;

FIG. 86 is a bottom plan view thereof;

FIGS. 87-88 are side views thereof;

FIGS. 89 and 90 are rear and front perspective views respectively of afuel tank fastener;

FIGS. 91, 92, and 93 are rear plan, front plan, and side viewsrespectively thereof;

FIG. 94 is a front (exterior) perspective view of a corner capattachable to the corner members of the generator frame;

FIG. 95 is a rear (interior) perspective view thereof;

FIGS. 96 and 97 are front and rear plan views thereof;

FIGS. 98-101 are side views thereof from different perspectives;

FIG. 102 is an exploded view showing the corner cap and fuel tankfastener assembly;

FIG. 103 is a perspective view of a motor mount bracket;

FIG. 104 is a perspective view of a portable generator in the form of abackpack;

FIGS. 105-108 are perspective views of a portable generator fueled bycompressed gas canisters or cylinders.

All drawings are schematic and not necessarily to scale.

DETAILED DESCRIPTION OF EXAMPLES

The features and benefits of apparatuses, systems, methods, and otherinnovations disclosed are illustrated and described herein by referenceto non-limiting examples. This description of examples is intended to beread in connection with the accompanying drawings, which are to beconsidered part of the entire written description. Accordingly, thepresent disclosure expressly should not be limited to such examplesillustrating some possible non-limiting combination of features that mayexist alone or in other combinations of features; the scope ofprotection being defined by the claims appended hereto.

In the description of examples disclosed herein, any reference todirection or orientation is merely intended for convenience ofdescription and is not intended in any way to limit the scope of thepresent invention. Relative terms such as “lower,” “upper,”“horizontal,” “vertical,”, “above,” “below,” “up,” “down,” “top” and“bottom” as well as derivative thereof (e.g., “horizontally,”“downwardly,” “upwardly,” etc.) should be construed to refer to theorientation as then described or as shown in the drawing underdiscussion. These relative terms are for convenience of description onlyand do not require that the apparatus be constructed or operated in aparticular orientation. Terms such as “attached,” “coupled,” “affixed,”“connected,” “interconnected,” and the like refer to a relationshipwherein structures are secured or attached to one another eitherdirectly or indirectly through intervening structures, as well as bothmovable or rigid attachments or relationships, unless expresslydescribed otherwise.

FIGS. 1-7 illustrate a non-limiting example of a portable generator 20according to the present disclosure. The generator 20 may include anengine 30. The engine 30 may be an internal combustion engine, orvarious other engines or motors which may produce mechanical energy. Theengine 30 may be powered by a fuel or resource, such as natural gas,diesel fuel, propane, gasoline, or various other fuels.

The generator 20 may additionally or alternatively include an alternator32. The alternator 32 may be an electromechanical device in mechanicalcommunication and operably coupled with the engine 30. The alternator 32may include or use a rotating magnetic field with a stationary armature,a rotating armature with a stationary magnetic field, or a linearalternator. For example, the engine 30 may produce mechanical energywhen operated which the alternator 32 may convert into electricalenergy, such as without limitation alternating current.

Generator 20 may further include an onboard fuel tank 40 configured tostore fuel which is supplied to the engine 30 by a fluid coupling suchas without limitation a tube or hose. Generator 20 further includes acontrol panel 50 for operating and monitoring the generator, and toprovide an electrical connection interface for power generated by thegenerating unit. The foregoing components of the generator 20 aremounted to a support structure such as frame 28.

For convenience of further description, without limitation, generator 20may be considered to have a front 21, rear 22, first and second lateralsides 23 and 24, a top 25, and bottom 26 (see, e.g. FIG. 1). Thesedesignations are defined with generator 20 resting in a normal uprightoperating position on a horizontal support surface as shown. Generator20 defines a longitudinal axis LA extending from front 21 to rear 22along a centerline of the frame 28.

Various examples of generator 20 may further include floor supports toraise and space frame 28 above the floor. The floor supports maycomprise one or more sets of support legs 60 and/or wheel assemblies 80for transporting the generator. In some frames, one or more pairs ofhandlebars 160 may further be provided to further facilitate transportof the generator 20. These features will be further described herein.

Control panel 50 may be mounted on one of the lateral sides 23, 24 ofthe frame 28 by brackets 54 (see, e.g. FIG. 13) or other similarmethods. The control panel may alternatively be located in other mountedpositions. The control panel may include a plurality of controls 51 suchas switches and indicators 51, power outlets 52 which are electricallyconnected to alternator 32 and/or a power distribution panel, key start53, and other usual appurtenances.

FIGS. 8-14 show generator 20 with the fuel tank 40. Engine 30 is notshown in these figures to more clearly show the frame construction.

The fuel tank 40 may include a top 44, bottom 45, and opposing lateralsides 43. In one non-limiting example, top 44 of fuel tank 40 defines aforward sloping surface 41 and rearward sloping surface 42. Both slopingsurfaces 41, 42 assist with shedding water to minimize accumulation andprevent ingress of water into the tank such as during refueling. Thefront and rear sloping surfaces 41, 42 intersect linearly along alaterally extending peak 45 on the top of the fuel tank which definesthe highest point on the tank. In some fuel tanks 40, lateral sides 43may also be sloped outwardly towards the sides 25 and 26 of thegenerator 20 to shed water.

In one example, a removable fuel cap 48 which operably covers a fillspout 47 may be disposed on one of the sloping surfaces 41 or 42 tofacilitate filling the fuel tank 40. In one example, the fuel cap may belocated on rear sloping surface 42. Locating the fuel cap 48 and spout47 on a sloping surface creates better access and convenience forrefueling to minimize spills as the user has to reach less far with afuel can in contrast to flat topped fuel tanks with the fuel cap andfill spout located thereon. However, a flat topped fuel tank 40 mayalternatively be provided in some configurations. The fuel cap 48 andfill spout 47 may be mutually threaded to provide a screwed arrangement,but is not limited to such configurations.

Fuel tank 40 may be supported independently by frame 28 via supportflanges 49. In other systems, the tank 40 may be supported by theengine-alternator assembly 30-32.

The frame 28 may be configured and comprised of a first lateral sideframe 100 and an opposing second lateral side frame 101 spaced laterallyapart from side frame 100. In one construction, without limitation,frame 28 may be a substantially generally tubular frame formed of tubeor pipe having a circular cross section. Accordingly, in one example,lateral side frames 100, 101 may be cylindrically tubular inconstruction and configuration as shown. In other possibleconstructions, frame 28 may be formed of square or rectangular tubeshaving a rectilinear cross sectional shape.

Lateral side frame 100 generally includes a front vertical member 102,top horizontal member 105, rear vertical member 103, and bottom verticalmember 104 which may be formed as a unitary structure or joined togetherby any suitable means to form a continuous structure. Similarly, lateralside frame 101 generally includes a front vertical member 107, tophorizontal member 109, rear vertical member 106, and bottom horizontalmember 108 which may be formed as a unitary structure or joined togetherby any suitable means to form a continuous structure.

In some constructions, the horizontal and vertical members of lateralside frames 100, 101 may be multiple separate pieces joined together bywelding or brazing. In other constructions, the lateral side frames maybe formed of a single tube having two ends and which is first bent toshape and then joined at the ends after forming a loop.

The vertical and horizontal members of lateral side frames 100, 101 mayintersect at four corner sections 110 which preferably are rounded orangled as shown in some examples to preclude catching the frame onvarious object when generator 20 is being transported. Each cornersection 110 in one example may include a short straight section of tube112 of various lengths disposed between two elbows 111. In one example,the elbows 112 may be less than 90 degrees to avoid a squared cornersection 110. However, in other suitable but less preferred examples,some or all of the corners 110 may be square in configuration.

In one system, top horizontal members 105 and 109 may be angled betweenfront vertical members 102, 107 and rear vertical members 103, 106respectively to complement the shape of fuel tank 40. This may beprovided for not only aesthetic reasons, but also to help protect thefuel tank. Accordingly, when seen in side elevation view as in FIGS. 9and 11, lateral side frames 100 and 101 may have a generally asymmetricshape. In alternative configurations, top horizontal members 105, 109may have a straight or flat horizontal shape between the front verticalmembers 102, 107 and rear vertical members 103, 106 as shown for examplein FIGS. 24 and 25.

The lateral side frames 100 and 101 may be structurally connectedtogether by a front cross-piece 120 and a rear cross-piece 121 disposedproximate to the top 25 of generator 20. Cross pieces 120, 121 arelongitudinally spaced apart along the longitudinal axis LA from front torear, and extend laterally between the side frames 100, 101 to assistwith laterally stiffening the upper portion of frame 28. In one example,the cross-pieces 120, 121 may connected to corner sections 110 of eachlateral side frame 100, 101 by any suitable means such as withoutlimitation welding or brazing. It will be appreciated that cross-pieces120, 121 may be coupled to other portions of each lateral side frame100, 101 in other examples. The cross-pieces 120, 121 may be arrangedsubstantially parallel to each other and perpendicular to lateral sideframes 100, 101. In a certain construction, cross-pieces 120, 121 aretubular in configuration having a round cross-section similar to thelateral side frames 100, 101. However, the cross-pieces 120, 121 are notlimited to circular tubular constructions and may have rectilineartubular cross sectional shapes such as square or rectangular.

To help laterally stiffen the lower portion of frame 28, a pair oflongitudinally spaced apart cross-struts 130, 132 may be provided thatextend laterally between lateral side frames 100 and 101. In oneexample, cross-struts 130 may be connected to bottom horizontal members104 and 108 of the lateral side frames 100, 101. The cross-struts 130,132 may be arranged substantially parallel to each other andperpendicular to lateral side frames 100, 101. Cross-struts 130, 132 mayfurther be arranged substantially parallel to cross-pieces 120, 121. Inone configuration cross-struts 130, 132 may have a differentcross-sectional configuration than the cross-pieces 120, 121 such aswithout limitation rectilinear as further described herein for reasonswhich will become apparent. Cross-struts 130, 132 may be connected tolateral side frames 100, 101 by any suitable means including welding,brazing, mechanical fasteners, or other methods used in the art.

The frame 28 including lateral side frames 100, 101, cross-pieces 120,121, cross-struts 130, 132, and some other structural brackets,accessories, or appurtenances attached or coupled to the frame may bemade of any suitable material including metal or polymer. In oneconstruction, the frame is made of steel and/or aluminum. Any suitablecoating, finish, or topical treatment and texture may be provided.

In some systems, the frame 28 may be configured to provide a commoninterface configured and arranged to removably and interchangeably mounteither legs 60 and/or wheel assemblies 80 to frame 28 for transport andraising the frame 28 above the floor. This provides a floor supportsystem for generator frame 28 that is configurable and customizable tomeet the preferences and needs of each user. For example, a user mayelect four wheel assemblies 80 (see, e.g. FIG. 19E), four legs 60 (see,e.g. FIG. 19F), or a combination of legs and wheel assemblies mounted oneither of the cross-struts 130, 132. As further described herein, boththe legs and wheel assemblies have a common mounting arrangement andconfiguration advantageously allowing either wheel assemblies 80 or legs60 to be interchangeably used at any of the four mounting locations onthe cross-struts.

As shown in FIGS. 13, 16A-B, 22, and 23, cross-struts 130, 132 in onearrangment are configured to provide four mounting locations on frame 28for structurally supporting and attaching the wheel assemblies 80 orlegs 60. In addition, cross-struts 130, 132 may further be configuredfor mounting and structurally supporting engine-alternator assembly30-32 of the generator unit and associated appurtenances, as furtherdescribed elsewhere herein.

Cross-struts 130, 132 may have a non-tubular rectilinear cross-sectionalshape. In one configuration, cross-struts 130, 132 may each have theshape of a flanged structural C-channel including a U-shaped centralsection comprised of an axially extending web 134, pair of legs 133extending generally downwards and perpendicular from the web, and pairof lateral side flanges 131 extending generally outwards andperpendicular from the legs. Other suitable structural shapes, however,may be used.

FIG. 22 is a detailed exploded view of a wheel assembly 80 showing themounting system interface with cross-struts 130, 132. Each wheelassembly 80 includes an axle 81 rigidly attached to a mounting plate 82such as by welding, brazing, or other suitable means, a tire 83 having ahub 84 and wheel bearing 89 defining a through opening configured toreceive a portion of the axle there through, washers 85, and a cotterpin 86. The tire 83 is mounted on one end of the axle 81 and mountingplate 82 is mounted on an opposing end. In one example, as shown,mounting plate 82 may have a central portion that is concavely shaped tocomplement the convex shape of axle 81.

In one non-limiting exemplary construction, the axle 81 may terminate ator near the mounting plate 82 and does not extend across the lateralwidth of the frame 28 from side 24 to side 26. Accordingly, each wheelmay have its own separate axle 81 rather than an arrangement wherein twotires 83 may be mounted on opposing ends of a common axle.Advantageously, this provides two shorter and structurally more rigidaxles 81 which helps prevent breakage rather than using a single longside-to-side axis. This may sometimes occur in instances where thegenerator 20 may be hoisted and transported via a forklift or otherequipment.

With continuing reference to FIG. 22, mounting plate in oneconfiguration includes a pair of mounting holes 87 and a pair of angledmounting tabs 88. Each pair of mounting holes 87 and tabs 88 are spacedapart across axle 81 as shown and arranged such that a mounting tab andhole are disposed on each side of the axle. Mounting tabs 88, which mayprotrude upwards from the top of mounting plate 82, have a somewhatL-shaped configuration with a substantially vertical leg 88 a attachedto mounting plate 82 and a substantially horizontal free leg 88 bextending at an angle to the vertical leg. Mounting tabs 88 areconfigured to produce an interlocked relationship with cross-struts 130,132 when the wheel assemblies are mounted to the frame 28. Accordingly,cross-struts 130, 132 may each include a pair of spaced apart mountingholes 135 configured and arranged to be substantially aligned withmounting holes 87 and mounting tabs 88 when each wheel assembly 80 isaligned with and mounted on the cross-struts. Mounting holes 135 may bepreferably located in flange 131 of cross-struts 130, 132 Mounting holes135 are configured and dimensioned to receive mounting tabs.

To mount a wheel assembly 80 onto frame 28, the mounting plate 82 isfirst positioned below a cross-strut 130 or 132 with the mounting tabs88 vertically aligned with their corresponding mounting holes 135 in thecross-strut on each side of the axle 81. It should be noted that thedistance between each tab 88 and its respective companion mounting hole87 on each side of axle 81 in the mounting plate 82 is slightly largerthan the distance between each pair of corresponding mounting holes 135on each flange 131 of cross-struts 130, 132. Accordingly, when themounting tabs 88 are aligned with their corresponding mounting holes 135in the cross-strut 130 or 132, the companion mounting hole 87 (i.e. onthe same side of axle 81) for each tab will be intentionally slightlyoffset from and not perfectly concentrically aligned with the remainingmounting hole 135 on the cross-strut, for reasons which will becomeapparent.

Once the angled mounting tabs 88 are each aligned with theircorresponding mounting holes 135, the tabs are inserted upwards throughthe mounting holes (e.g. the inner mounting holes 135 on cross-strut 130or 132) to abuttingly contact the top of the mounting plate 82 with thebottom of the cross-struts 130, 132. The mounting plate 82 with attachedaxle 81 and tire 83 is then slid inwards in an axial direction along thecross-struts 130 or 132 to interlock the mounting tabs 88 with eachopposed flange 131 on the cross-strut. This engages each mounting tab 88with the cross-strut at the holes 135 such that the horizontal leg 88 bof the tab slides over the top of flange 131 of the cross-strut therebytrapping the flange in the gap formed below the horizontal leg 88 b andtop of the mounting plate 82. FIG. 16A shows an analogous arrangement ofan angled mounting tab 88 seated with cross-strut 130 or 132.

Upon engaging the angled mounting tabs 88 with the cross-strut 130 or132, the remaining holes 135 in the cross-strut will now each becomeconcentrically aligned with its corresponding mounting hole 87 in wheelassembly mounting plate 82. A threaded fastener 136 is then insertedthrough each pair of aligned holes 135, 87 and tightened with a threadednut 137 to finish securing the wheel assembly 80 to the cross-struts 130or 132 and frame 28. Each tire 83 is mounted outboard of frame 28 whenwheel assembly 80 is mounted on cross-struts 130, 132.

Since the wheel assembly 80 are detachably mounted to frame 28, theforegoing assembly steps are simply reversed to remove the wheelassembly.

Legs 60 in one arrangement may have an identical mounting interfacearrangement with frame 28 and cross-struts 130, 132 as wheel assemblies80 described above. Since the mounting holes 135 in cross-struts 130,132 are all identical in size, location, and arrangement as part of aninterchangeable frame support system, a user may elect tointerchangeably mount either wheel assemblies 80 or legs 60 at any ofthe four mounting locations on cross-struts 130, 132 thereby providingan opportunity for customization.

Each support leg 60 may be formed of angled metal plate which is bentand/or welded or brazed together. In one construction, the leg may besteel or aluminum. Legs 60 may have any suitable configuration, butpreferably should be shaped and constructed with sufficient strength andstiffness to support the generator 20. In one configuration, leg 60includes a substantially flat top mounting plate 61 which is orientedhorizontally, two side plates 62 disposed at about 90 degrees to eachother and attached to plate 61, and a flat bottom plate 63 attached toside plates 62. Plates 61 and 63 may be substantially parallel to eachother. Side plates 62 may taper inwards from top to bottom to provide awide support platform at top for engaging cross-struts 130, 132, and anarrower footprint at bottom for engaging the floor or other horizontalsupport surface.

In one construction, a pad 64 may be attached to leg 60 at bottom plate63 and formed of a resilient material such as rubber or anotherelastomeric material to provide surface grip and vibration dampening.Holes 65 and 66 may be provided in bottom plate 63 and pad 64respectively in some examples to receive a mounting fastener therethrough (not shown). Pad 64 engages the mounting floor or other surfaceon which the generator 20 will be located.

With continuing reference to the foregoing figures, legs 60 includeangled mounting tabs 88 and mounting holes 87 which are configured,dimensioned, and arranged no mounting plate 61 to have the same spatialrelationship as in mounting plate 82 of wheel assembly 80 as alreadydescribed herein. This permits the legs 60 to be interchangeable withwheel assemblies 80.

Legs 60 are mounted to cross-struts 130, 132 in the same manner as wheelassemblies 80 described above; the mounting process not being repeatedherein for sake of brevity. FIGS. 16A and 16B show legs 60 fully mountedand fastened to cross-struts 130, 132. Locking tab 88 appears protrudingupwards through and above flange 131 of the cross-struts in theinterlocked position.

In some systems, the frame 28 may be configured to provide a universalengine mount system that allows engines 30 having differentcharacteristics to be interchangeably mounted to a single configurationand size generator frame. The different engine characteristics mayinclude, without limitation, electrical output capacity (e.g. measure inWatts or KW), engine type (e.g. two-stroke, four-stroke), fuel type(e.g. gasoline, diesel), auxiliary equipment, and others. In oneexemplary arrangement, without limitation, a common engine mountarrangement is provided which includes four frame engine mounts 140fixedly attached to cross-struts 130, 132. A pair of laterally spacedapart engine mounts 140 are mounted on each of the cross-struts 130,132. The engine mounts 140 are preferably each configured and arrangedidentically to provide a common interface with four mating commonlyconfigured and arranged engine mount brackets 34 (see, e.g. FIGS. 1-7and 16A) that are provided on a plurality of engines 30 having at leastone different engine characteristic. Preferably, without limitation, thespatial relationship between the engine mount brackets 34 are common toeach of the plurality of different engines 30 to allow interchangeableuse of the engines with a single frame 28 setup.

FIG. 16A shows the frame engine mounts 140 and engine mount brackets 34in greater detail. Each frame engine mount 140 includes a top plate suchas angled top plate 142 configured for engaging an engine mount bracket34 on the engine 30 and a bottom plate such as an angled bottom plate143 configured for attachment to cross-struts 130, 132. Top plate 142includes a substantially horizontal flat section 142 a and a conjoinedangled flat section 142 b disposed at an angle to the horizontalsection. The horizontal top section 142 a may include an upward turnedlip 142 c to assist with placing and locating the engine mount bracket34 on top plate 142.

Bottom plate 143 of frame engine mount 140 may have a similarconfiguration as top plate 142 as shown in FIG. 16A having a horizontalflat section 143 a and angled flat section 143 b. Bottom plate 143 maybe spaced vertically below the top plate 142 in one arrangement. Thehorizontal section 143 a of bottom plate 143 may be attached tocross-struts 130, 132 while the angled section 143 b is free andprojects upwards from the cross-strut at an angle thereto as shown. Inone construction, without limitation, top plate 142 and bottom plate 143may each be made from a single metal plate that is bent to shape toproduce the horizontal and angled sections.

With continuing reference to FIG. 16A, the top plate 142 may beconnected to bottom plate 143 by a connecting rod 144 extending betweenthe angled sections of each plate 142 and 143. In one arrangement, onlythe connecting rod 144 supports the top plate 142 from the mountingplate 143 and cross-struts 130, 132 in turn. This arrangementadvantageously provides a flexible mount which assists with dampeningengine vibrations transmitted between the engine and frame 28. A motormount bushing or spacer 145, which in some constructions can be metal,may be mounted around rod 144 between top and bottom plates 142, 143 foradditional support.

Referring to FIG. 13 and particularly 16A, frame engine mounts 140 maybe pedestal-style engine mounts and include a threaded stud bolt 141projecting upwards from top plate 142 of the engine mount. Stud bolt 141is configured and dimensioned for insertion through a mating mountinghole 36 provided in engine mount bracket 34. Stud bolt 141 may bevertically oriented in some examples as shown, or be disposed at anangle with respect to vertical. The orientation of stud bolt 141 willdepend on the corresponding orientation of the mounting hole 36 in theengine mount brackets 34 and is not limited to any particularorientation or arrangement so long as the engine 30 may be securelymounted to the frame engine mounts 140.

After the engine mount brackets 34 is slipped over the bolt 141, athreaded nut is used to securely fasten the bracket to the top plate142. This process is repeated at all four motor mounting locations onframe 28 to complete installation of the engine 30 on the frame. In someconstructions, to further provide additional engine vibration dampeningand isolation, a resilient spring or bushing 145 (not shown) such aswithout limitation rubber or an elastomer may optionally be mountedbetween the top plate 142 and engine mount bracket 34 around rod 144.Such engine vibration dampening devices are well known in the artwithout further elaboration.

It will be appreciated that engine mount bracket 34 may have numeroussuitable configurations so long as the bracket structure includes amounting hole 36 for receiving the engine mount stud bolts 141 on theframe 28. Similarly, frame engine mounts 140 may have other suitableconfigurations. Accordingly, the systems are not limited by theexemplary engine mount brackets 34 or frame engine mounts 140 disclosedherein.

The frame 28 may be configured to provide a handlebar mounting systemthat is configurable and customizable to meet the preferences and needsof each user. For example, a user may elect a single handlebar 160mounted horizontally to frame 28 in a wheelbarrow-type arrangement (see,e.g. FIG. 19A), two horizontally mounted handlebars 160 (see, e.g. FIG.19D), a single handlebar 160 mounted vertically to frame 28 in a handtruck type arrangement (see, e.g. FIG. 19C), or any combination thereof.As further described herein, the frame 28 and handlebar 160 arecooperative configured with an interface that provides both horizontaland vertical mounting options and multiple simultaneous handlebarmounting arrangements.

The handlebar 160 may include a first handle assembly 161 (e.g. left inreferenced figures) and second handle assembly 162 (e.g. right inreferenced figures) joined together by a laterally extending andelongated tie piece such as without limitation tie bar 166. Tie bar 166is preferably rigid in construction and have any suitable configurationsuch as a substantially flat bar as shown, tubular, and others.Preferably, the tie bar 166 is made metal such as without limitationsteel or aluminum. Other suitable metals or other materials may be usedto provide the intended structural functionality. Tie bar 166 is fixedlyattached to the handle assemblies 161, 162 such as by welding, brazing,or mechanical means to provide a stiff connection between the handleassemblies. In some configurations, tie bar 166 may be provided such aswhen each handle assembly 161 or 162 have sufficient lateral stiffnessto avoid undue deflection and movement.

Each handle assembly 161, 162 includes an elongated handle 163 having aproximal grasping end 164 and opposing distal mounting end 165 forconnection to generator frame 28. In one construction, handle 163 may betubular having a generally round cross-section. However, other suitableconfigurations and cross-sectional shapes may be used such as handleshaving a rectilinear cross-sectional shape, solid round bars, etc.Preferably, handle 163 is constructed of a material having sufficientstrength and thickness to allow a user to lift the generator 20 withoutbending or deforming the handlebar. In one example, handle 163 ispreferably made of metal such as without limitation steel or aluminum.Other suitable metals or other materials may be used to provide theintended functionality.

In some configurations, handle 163 may include an angled section 168 toproduce an axial offset between the grasping and mounting ends 164, 165as shown in FIGS. 20A and 21. This provides wider lateral spacingbetween the grasping ends 164 of the handle for a user. In otherexamples, handle 163 may be substantially straight between grasping andmounting ends 164, 165.

A grip 167 may be mounted on grasping end 164 of handle 163 to provide acomfortable grasping surface for a user. Grip 167 may have any suitableergonomic configuration and be made of any type material includingresilient polymeric materials to facilitate gripping. The surface of thegrip 167 may be textured and/or include features such as ribbing,stippling, nubs, etc. to further facilitate comfort and grip.

Referring to FIGS. 14B, 19B, 20A, 20B, and 21, mounting end 165 ofhandle 163 is configured to engage a clamp 170 mutually configured withand operable for attachment to generator frame 28. In one example, clamp170 may be horizontally spilt collar including a top half section 171and bottom half section 172. In one example, each half section has ahalf-tubular concave surface 173 with an arcuate curvature orientedtransverse to longitudinal axis LA and a half-tubular concave surface174 with an arcuate curvature oriented parallel to the longitudinal axisLA. The top and bottom half sections 171, 172 together form a firstsplit collar aligned with handle 163 which includes concave surfaces 173and a second split collar aligned with a front or rear cross-piece 120,121 which includes concave surfaces 174; the second collar beingoriented perpendicular to the first split collar.

When the two half sections 171 and 172 are joined together, both concavesurfaces 173 collectively define a tubular shape that defines a circularrear facing opening 175 or socket which is configured and dimensionedfor receiving mounting end 165 of a handle 163. When the two halfsections 171 and 172 are joined together, both concave surfaces 174collectively define a tubular shape that defines a circular laterallyfacing opening 174 or socket (e.g. left or right) which is configuredand dimensioned for receiving a portion of front cross-piece 120 or arear cross-piece 121 of frame 28. The rear and lateral facing openingsor sockets may have other configurations to match and receive handles orframes having other non-circular cross sectional shapes.

Referring again to FIGS. 14B and 20B, top and bottom half sections 171,172 of clamp 170 may be removably connected together in one example byany suitable means. A threaded fastener 169 a (e.g. bolt/screw) andmating nut 169 b may be used as a non-limiting example. To facilitatealigning the top and bottom half sections 171, 172 for assembly, a tab182 and slot 183 may be provided on each half section which fit togetherand interlock when the half sections are joined. It will be apparentthat the tab 182 and slot 183 will alternate in relative position on thetop and bottom half sections 171, 172 for insertion of a tab in a slotand vice-versa. In one example, as shown in the referenced figures, thetab 182 and slot 183 may be formed in a peripheral edge portion ofconcave surfaces 174 closest to frame front cross-piece 120 or rearcross-piece 121. Other suitable arrangements are possible.

Referring to FIGS. 14B and 20B, bottom half section 172 may include apositioning flange 190 including two arcuately spaced apart holes 191and 192. Holes 191 and 192 are preferably separated by an arc distanceof 90 degrees apart. In one configuration, the positioning flange 190forms a segment of or partial annularly shaped flange that extendsaround and is disposed at one end of concave surface 174 on the bottomhalf section 172 as shown. The flange 190 forms a substantially flatarcuate surface 193 which faces outwards towards on or the other oflateral side frames 100, 101. Flange 190 is rotatable in relation to andabout front cross-piece 120 or a rear cross-piece 121 by rotating thehandlebar 160. It should be noted that in other configurations,positioning flange may alternatively be formed on top half section 171.Either arrangement is suitable.

Frame 28 includes a locking flange 180 which cooperates with positioningflange 190 to lock the position of handlebar 160 in either a horizontalor upright vertical position (see, e.g. FIGS. 19A and 19C). In oneexample, a locking flange 180 may be positioned on frame 28 near each offour top corner sections 110 to provide flexibility for a user to mounthandlebars 160 on either the front or rear end of the frame, or on bothends (see, e.g. FIG. 19D). Locking flange 180 includes a single hole 181that is fixed in position in relation to generator frame 28. Hole 181 isselectively and concentrically alignable with either hole 191 or 192 ofthe positioning flange 190 by rotating the handlebar 160 betweenhorizontal or vertical positions.

Referring to FIGS. 14B, 19B, and 20B, a locking pin assembly 184 may beprovided which cooperates with locking flange 180 and positioning flange190 to selectively lock the handlebar 160 in the horizontal or verticalposition. The locking pin assembly 184 includes an cylindrical body 185and a locking pin 186 at one end. Pin 186 is configured and dimensionedto be insertable through hole 181 in flange 180 and hole 191 or 192 inflange 190. Pin 186 is movable between a (1) locked position in whichthe pin projects inwards through holes 180 and 191/192, or (2) anunlocked position in which the pin is retracted outwards from holes 180and 191/192.

An exemplary method for mounting a handlebar 160 on frame 28 will now bedescribed with reference to 14B, 20A, 20B, 21, and 19B. The top andbottom half sections 171, 172 of two clamps 170 are first positionedover and under one of the front or rear cross-pieces 120, 121,respectively. The clamps 170 are selected and arranged so that thepositioning flange 190 of each clamp 170 is located towards a lateralside frames 100, 101 proximate to a locking flange 180. The top andbottom half sections 171, 172 are next brought together and engaged withthe front or rear cross-piece 120, 121 selected. The tabs 182 and slots183 are used to guide proper alignment and joining of the top and bottomhalf sections 171, 172. The front or rear cross-piece is trapped betweenthe concave surfaces 172 in the top and bottom half sections 171, 172.Threaded fastener 169 a is then inserted through the top and bottom halfsections 171, 172 (see FIG. 20B) and engaged with nut 169 b which ispartially tightened at this stage of assembly so that the clamp 170 willnot slip off of the front or rear cross-piece 120, 121.

With continuing reference to the foregoing figures, the mounting ends165 on each handle 163 are inserted into one of the clamps 170 throughrear opening 175 and engaged with concave surfaces 173 on the top andbottom half sections 171, 172. Fastener 169 a may then be furtherslightly tightened, but preferably not fully to lightly engage and holdhandles 163 in the clamps 170 while still allowing the handlebar 160 tobe rotated about the front or rear cross-piece 120, 121 for the desiredposition of the handlebar.

The handle bar 160 with attached clamps 170 are then rotationallyadjusted in position about the front or rear cross-piece 120, 121 toconcentrically align hole 181 in each locking flange 180 on the frame 28(see FIG. 20B) with one of the holes 191 (for horizontal handlebarmounting position) or 192 (for vertical handlebar mounting position) ineach of the handlebar positioning flanges 190. Once the holes arealigned, the locking pin 186 is inserted through the aligned holes tofix and lock the position of the handlebar 160. The fastener 169 a maythen be fully tightened with nut 160 b to firmly engage the front orrear cross-piece 120, 121 and form a frictional fit between the clamps170 and front or rear cross-piece.

It will be appreciated that the foregoing handlebar mounting process andsequence may be varied and still achieve the same result. Accordingly,equivalent mounting processes are possible and the systems are notlimited to the foregoing sequence of steps described.

If the user desires to change the mounting position/orientation of thehandlebar 160, the clamps 170 may be slightly loosened by partiallyunscrewing the fasteners 169 a in each clamp and retracting the lockingpins 186 from the holes 180 and 191/192 in the locking flanges andpositioning flanges. The handlebar 160 will now be rotatable about thefront or rear cross-piece 120, 121 to change the position of thehandlebar from horizontal to vertical, or vice-versa.

FIGS. 24-30 illustrate an alternative configuration and features of agenerator 20 and frame 28. The generator 20, frame 28, support legs 60,and wheel assemblies 80 may be essentially the same as already describedherein for generator 20 and frame 28 with reference to FIGS. 1-24.Instead of or in addition to handlebars 160 described herein, handlebarshaving an alternative configuration, construction, and functionality areprovided.

The generator 28 includes a pivotably mounted front handlebar assemblycomprising a handlebar 250 movably coupled to frame 28 near the front21. Handlebar 250 may have a generally U-shaped tubular body includingtwo mounting portions 252 arranged substantially parallel to each otheralong the longitudinal axis LA and a grasping portion 253 arrangedsubstantially perpendicular to and spanning between the mountingportions at one end 254 of the handlebar. Grasping portion 253 may bevertically offset from and positioned below the mounting portions 252.In one arrangement, each mounting portion 252 may be mounted to one ofthe top horizontal frame members 105 or 109 about a pivot axis 251oriented transversely to longitudinal axis LA. The mounting portions 252may be mounted to the frame members about pivot axis 251 proximate tothe free ends 255 of the handlebar 250, and in one configuration isspaced inwards from the free ends. In one assembly, the pivot axis 251may be formed by transversely mounted pivot members 256 such as pins orfasteners extending through mounting portions 252 of handlebar 250 andtop horizontal members 105 and 109. In one configuration, the handlebar250 may be disposed inside the top horizontal members 105 and 109.

Handlebar 250 is pivotably movable with respect to frame 28 between afolded stowed position (see, e.g. FIGS. 24 and 25) and an extendedoperating position (see, e.g. FIG. 29 shown by dashed lines). In thestowed position, handlebar 250 is nested in the top 25 of the framebetween the longitudinally-extending top horizontal members 105 and 109.The mounting portions 252 are oriented substantially horizontal inposition. In the operating position, the grasping portion 253 ofhandlebar 250 is rotated forward about the pivot axis 251 to raise andlocate the mounting portions 252 in a non-horizontal position. Thehandlebar 250 protrudes outwards from the frame for transportinggenerator 20. In one configuration, the mounting portions 252 may beoriented in a generally upright position defined herein as being greaterthan 0 degrees (horizontal) and less than or equal to about andincluding 90 degrees (vertical). This arrangement allows the generator20 to be transported in hand truck fashion with the handlebar 250 beingupright and vertically or obliquely oriented with respect to the tophorizontal members 105 and 109 of frame 28.

To guide and limit the pivotable range of motion of the handlebar 250, aflat guide plate 257 may be fixedly attached to one or both of eachopposing top horizontal members 105 and 109. Guide plate 257 includes anarcuately-shaped open guide slot 258 extending 90 degrees between afirst and second closed end of the track. A spring-loaded position pin259 is fixedly connected through the guide plate 257 and guide slot 258to the handlebar 250 at or near one of the free ends 255 of thehandlebar. The position pin 259 is arcuately movable in guide slot 258with free ends 255 by rotating the handlebar 250.

The ends 260 of the guide slot 258 may be diametrically enlarged andconfigured with the position pin 259 for mutual engagement to removablyretain the pin 259 at either end location of the slot. The end 260locations of guide slot 258 define the stowed and operating positions ofhandlebar 250. To enable position pin 259 to move in the guide slot 258,an enlarged operating end 261 of the pin may be moved and either pulledoutwards (in the situation where pin 259 is biased inwards by thespring) or pushed inwards (in the situation where pin 259 is biasedoutwards). In one exemplary configuration, the pin 259 is inwards biasedrequiring an outward pull to release and move the pin. This releases thepin 259 from one of the ends 260 of the guide slot 258, thereby allowingthe pin to be moved through the slot to the other end location.Accordingly, an interlock formed between ends 260 and position pin 259allow the handlebar 250 to be removably locked in either the stowed oroperating positions.

Referring to FIGS. 24-30, an alternative rear handlebar assemblyincluding handlebars 270 is shown which is pivotably movable between astowed position collapsed against the rear vertical members 103, 106 offrame 28 and an operating position extending approximately horizontallyoutwards to the rear of the generator 20. This allows generator 20 to betransported in wheelbarrow fashion. Each rear handlebar 270 includes asubstantially U-shaped mounting clevis 271 on one end that may bemovably mounted to rear vertical members 103, 106 of frame 28 about atransversely-oriented pivot axis 274. Each clevis 271 may include a pairof spaced apart ears 272 positioned on opposite sides of either verticalmembers 103 or 106. The ears 272 are mounted to the rear verticalmembers 103, 106 by a transversely mounted pivot member 273 such as apin or fastener extending through the ears and vertical members asshown. In one configuration, the mounting clevis 271 and pivot members273 are configured to retain the handlebars 270 in the stowed andoperating positions via a frictional fit.

In one configuration shown in FIGS. 24-30, generator 20 may include alifting bar 280 transversely mounted to top horizontal members 105 and109 of generator frame 28. Each end 282 of the lifting bar 280 may beconfigured to engage a frame horizontal members 105 and 109, which maybe secured thereto with mounting fasteners 281 such as withoutlimitation threaded fasteners and nuts. Other suitable means may be usedto mount the lifting bar 280 to frame 28, such as welding, soldering,rivets, etc. The lifting bar 270 extends under and is not operablyconnected to front handlebar 250 so as to not interfere with thepivotable movement of the handlebar. In one construction, lifting bar280 may have a tubular metal construction for strength. Lifting bar 280may be substantially V-shaped in one configuration forming an apex whichis raised above than top horizontal members 105 and 109 of frame 28 forgrasping manually or with lifting equipment.

In an alternative configuration shown in FIG. 19A, the lifting membermay be a lifting strap 210 which is attachable to a top portion of theframe 28 and spans between the lateral side frames 100, 101. The liftingstrap may be formed of any suitable material including metal, polymerichigh strength fibers, etc.

The generator frame 28 may be configurable to provide a power cordmanagement system. As shown in FIGS. 17, 18A, 18B, and 24-30, two ormore outwards projecting cord wrapping poles 200 may be provided whichare mounted on generator frame 28 to allow a power cord 201 to bewrapped around the poles for convenient storage. In one arrangement, thepoles 200 are preferably mounted on the top 24 of the frame 28 andproject vertically upwards, and more preferably in some arrangements maybe mounted on top horizontal members 105 and/or 109. Other suitablemounting positions of wrapping poles 200 and orientations (e.g.horizontal or vertical) may be used. The poles 200 may be configured forattachment to frame 28 by any suitable means including separately or incombination clamping, fasteners, rivets, adhesives, etc. In variousexemplary configurations, the poles 200 may be mounted to top horizontalmembers 105 and 109 of frame 28 and/or front handlebar 250. Atransversely oriented flanged end 202 may be provided having a widthgreater than the diameter of the poles 200 to prevent the power cord 201from slipping off the poles. The poles 200 may be made of any suitablematerial including metal or polymers.

According to another aspect of the generator 20, a maintenance reminderkit including a maintenance reminder module 290 may be provided to trackand alert an operator in real time to the maintenance related engineoperating parameters requiring attention. This module 290 essentiallytakes the guesswork out of separately tracking when routine maintenanceneeds to be performed. FIGS. 31 and 32 show two exemplary configurationsof a maintenance reminder module 290.

Maintenance reminder module 290 may comprise a microprocessor andappropriate electronic circuitry configured and operable to obtain,process, and display engine, electrical system, and/or auxiliarycomponent maintenance-related operating information. In oneconfiguration, maintenance reminder module 290 may communicate with theengine control system to download and process the desired operatingparameter for extracting maintenance related data or information. Inalternative or additional configurations, maintenance reminders may beinitiated and based on engine run time and preprogrammed thresholdsoperating times or maintenance intervals for initiating each maintenanceoperation (e.g. change oil, air filter, etc.).

Module 290 may include a faceplate 291 including a display 292, amaintenance indicator array 293 comprised of one or more conditionindicator lights, and an operating button 294. The faceplate 291 may bemounted proximate to and/or on an electronics housing 295 housing theelectronic components of the maintenance reminder module 290, or thefaceplate may alternatively be mounted on one part of the generatorframe 28 and the electronics housing may be mounted on another differentpart of the frame distanced from and not mechanically coupled to thefaceplate. Alternatively, the electronic components of the maintenancereminder module 290 may be incorporated and housed with the enginecontrol system components and the faceplate 291 may be mounted on theframe at a suitable location, thereby eliminating a need for a separateelectronics housing 295. The faceplate 291 may be mounted to generatorframe 28 at any suitable location. In one non-limiting arrangement, themaintenance reminder module 290 may be mounted on control panel 50.

Referring to FIG. 31, the indicator lights of the maintenance indicatorarray 293 may be illuminated buttons, bulbs, LEDs, etc. that includesuch maintenance-related alerts as without limitation “Change Oil,”“Change Spark Plug,” “Change Air Filter,” and “Add Oil” in thisnon-limiting example. When an engine operating condition associated withone of the foregoing maintenance parameters reaches a predetermined setpoint or level based on run time or actual monitoring of engineoperation, the indicator will become illuminated until cancelled bypressing the operating button 294, which may function as a reset button.The display 292 may be an LCD, LED, or other suitable type illuminateddisplay showing for example and providing a digital readout of the totalrunning time of the generator 20 (e.g. service hours) from initialpurchase and operation of the unit. The control circuitry may beconfigured so that the total running time cannot be reset with button294. It will be appreciated that additional and/or other enginemaintenance indicators may be used to alert an operator to a requiredmaintenance condition.

FIG. 32 shows a maintenance reminder module 290 in which the display 292may provide a real time digital readout of a selected engine-relatedmaintenance parameter. As opposed to alerting an operator whenmaintenance work may be immediately required, an operator can to trackthe status of maintenance related engine operating parameters to planmaintenance work in advance. The operating button 294 may be configured(in circuitry) to function as both a maintenance parameter select and areset button. Repeatedly pressing button 294 sequentially cycles thedisplay 292 through each maintenance parameter in a predetermined order.The indicator light associated with the maintenance parameter orinformation being displayed will be illuminated.

In one non-limiting exemplary configuration, the maintenance parametertracked and displayed on display 292 may include “Power %” (availableelectric power), “Oil %” (remaining oil life), “Air Filter %” (remainingair filter life), “Spark Plug %” (remaining spark plug life, “ValveAdjustment %” (remaining valve adjustment life, and “Run hours” (totalrunning time or service hours of the generator 20 from initial purchaseand operation of the unit). Other or additional parameters may betracked.

In one mode of operating the maintenance reminder module 290 of FIG. 32,the maintenance parameter displayed may automatically change and loopthrough each parameter for predetermined period of time (e.g. 3 or moreseconds). The maintenance parameter displayed may also be changedmanually by repeatedly depressing the operating button 294. Whenmaintenance is required, the circuitry may be configured to cause theassociated indicator light to flash or blink repeatedly. In someconfigurations, the circuitry may be configured to initiate the blinkingmode when about 10% or less life is remaining for the blinking parameterproviding advance notice. The associated remaining life may beconcurrently displayed for the blinking parameter. In one configuration,preferably after maintenance has been performed, the operating button294 may be held for a predetermined period of time (e.g. 3 seconds orother) to reset the blinking parameter to 100% life. The operatingbutton circuitry may be configured so that holding the operating button294 may not reset the total operating hours or run time.

It will be appreciated that numerous variations of the maintenanceindicator array 293, maintenance indicators provided, and programmedfunctionality are possible.

Modular Generator Frame System

FIGS. 33-103 depict various views of a portable generator 398 withmodular generator frame system 300. The frame system 300 may generallyinclude a plurality of interconnected corner members 320 and connectorplates 340 that collectively form an open space frame designated hereinas generator frame 301. The generator frame 301 is configured formounting various components of a power generator, appurtenances, andaccessories. In one configuration, generator frame 301 may support apermanent fuel tank 360, a removable portable fuel tank 380, engine 311,handles 318 for lifting and maneuvering the generator, control panel400, and others appurtenances and accessories (e.g. tool holders, fireextinguisher holders, power cord wrapping poles, etc.) for forming afully functional generator. Any suitable type of engine and fuel sourcemay be used, including for example without limitation liquid fuels orgaseous fuels such as propane.

Generator frame 301 may include four lateral sides 302, a top 303,opposing bottom 304 and an open interior space 305 for housing the fueltank 360, engine 311, and other accessories or appurtenances. The fourlateral sides 302 may be joined together by four vertically extendingcorners 306 at the top 303 and bottom 304 of the frame. In oneconfiguration, corners 306 may be disposed at a diagonal and obliqueangle to the two adjoining lateral sides 302 as shown. Other cornerconfigurations are possible.

Generator frame 301 may be considered to generally have the shape of acube wherein the lateral sides 302 have a substantially similar heightand width. The corners 306 may have a truncated shape in appearancecreated by the diagonal configuration of the corners. Accordingly, inone configuration, the generator frame 301 may appear to have anidentical profile when viewed from either of the sides, the top, or thebottom. The diagonal corners 306 provide a generally octagonal shape (intop plan or side view) for generator frame 301 in one configuration.

The corner members 320 and connector plates 340 will now be described ingreater detail with general reference to FIGS. 51-66. Each corner member320 may include a central body 321 and one or more outwardly andradially projecting mounting tangs 322 cooperatively configured toengage locking elements on the connector plates 340 for assembling acomplete frame 301. Body 321 may be open in structure in oneconfiguration defining a central opening 323 for weight reduction and toallow various appurtenances or accessories to be mounted and positionedtherein and therethrough. The central opening 323 may have acomplementary configuration to the perimeter shape of the central body321, or alternatively a different shape.

In one non-limiting example, body 321 may be generally triangular shapedwith truncated corners forming six integral short and long segments asshown defining a three-sided corner structural element. The shortsegments 324 may be disposed adjacent a connector plate 340 at eachcorner region and the long segments 325 having a longer length spanbetween two short segments 324. The short and long segments 324, 325 mayhave any configuration including polygonal and/or non-polygonal shapes.The short segments 324 define mounting portions 341 which includeradially extending mounting tangs 322 for coupling to a connector plateassembly comprising a pair of coupled connector plates 340, as furtherdescribed herein. In one configuration, as shown, each corner member 320includes three mounting portions 341 and mounting tangs 322 which mayeach be arranged approximately 120 degrees apart about a common centerpoint 327 defined at the geometric center of the corner member body 321.Each mounting tang 322 defines a mounting axis 330 which intersect atthe common center point 327 of body 321; the mounting tangs extendingradially outwards from the center point along the mounting axis.

Mounting tangs 322 may have an elongated shape. The mounting tangs 322include a free end 325 configured to lockingly engage a connector plate340 and a fixed end 326 attached to or integrally formed with centralbody 321 of the corner member 320. In one construction, withoutlimitation, mounting tangs 322 may be integrally formed with body 321 aspart of a single unitary structural unit that may be bent or otherwiseformed into the shape shown. In one arrangement, mounting tangs 322 areobliquely disposed at an angle A1 with respect to the corner member body321. This allows the creation of angled corners for the generator frame301 in which the central body 321 of corner members 320 are disposed atan angle A1 between 0 and 90 degrees to the connector plates 340 whenmounted on the mounting tangs 322. In some non-limiting examples, A1 maybe about 45 degrees.

For convenience of reference, the shape and features of generator frame301 may be further described with respect to a three-dimensional X-Y-ZCartesian coordinate reference system (see, e.g. FIGS. 33, 36, and 38).The reference system includes X, Y, and Z axes and defines an X-Y, X-Z,and Y-Z reference planes.

The central body 331 of the corner members 320 may form four generallyflat diagonal corners 306 of generator frame 301 each laying in a planeP1 that may be disposed at angles A2 and A3 with respect to both the X-Yand Y-Z reference planes. In one non-limiting configuration, angles A2and A3 may each be between 0 and 90 degrees. In some non-limitingexamples, angles A2 and A3 may be about 45 degrees. In a similar manner,corner members 320 may further form four generally flat sloping topsides and corresponding bottom sides of generator frame 301 (extendingin the X and Z directions) each laying in a plane P2 that may bedisposed at angles A4 and A5 with respect to both the X-Y and X-Zreference planes. In one non-limiting configuration, angles A4 and A5may each be between 0 and 90 degrees. In some non-limiting examples,angles A4 and A5 may be about 45 degrees.

In one exemplary construction, corner members 320 including central body321 and mounting tangs 322 may be formed from a single generally flatplate or sheet. Corner member 320 may therefore comprise a singleunitary structural component. The corner members 320 may be made ofsuitable metal material having sufficient mechanical/structural strengthand thickness, such as without limitation aluminum, steel, or othermetallic materials. In one example, without limitation, corner members320 may be made of aluminum sheet material having a thickness rangingfrom about and including 0.125 inches to 0.625 inches. In one example,without limitation, the thickness without limitation is about 0.125inches. Corner members 320 may be made by any suitable fabricationprocess or combination of processes, including for example withoutlimitation die-stamping, bending, casting, forging, machining, milling,drilling, etc.

Referring to FIGS. 51-58, connector plates 340 may have an axiallyelongated and generally flat body including an axial centerline 348, anouter surface 348, inner surface 349, opposing ends 350, and opposinglateral sides 351. Axial centerline 348 aligns with mounting axis 330defined by mounting tangs 322 when the corner members 320 and connectorplates 340 are assembled. When assembled, a pair of connector plates 340may be coupled together with opposing inward facing inner surfaces 349covering opposing outer and inner surfaces 331, 332 of the mountingtangs of corner members 320. Connector plates 340 may have a lateralwidth W1 and axial length L1 larger than the width. The lateral sides351 may have any shape (in top plan view), including straight, convex,concave, angled, and others.

The corner members 320 and connector plates 340 may each includemutually configured and mating mechanical interlock features to form astrong, mechanically coupled generator frame 301. The interlock featuresmay include a lateral interlock feature and an axial interlock feature.

In one non-limiting example to form a lateral interlock feature, theconnector plates 340 may include lateral locking tabs 343 configured toengage complementary configured lateral locking recesses 328 formed inlateral sides 333 of the mounting tangs 322 of each corner member 320.The locking tabs 343 may project inwardly on the connector plates 340towards and in a direction transverse to an axial centerline 348 definedby the connector. In one configuration, two locking tabs 343 may beprovided. Locking tabs 343 may be offset from axial centerline 348. Inone configuration, locking tabs 343 may be integrally formed as unitaryparts of opposing raised peripheral portions 347 formed on the innersurface 349 of connector plates 340. Each raised portion 347 projectsabove the inner surface and is axially elongated extending for adistance parallel to centerline 348. In one exemplary configuration,raised portions 347 may each extend axially from a point proximate to anend 350 of the connector plate 340 to a point proximate to the midlineM1 of the connector plate 340 (M1 being defined as lying across a pointmidway between opposing ends 350 and dividing the connector into twohalves). Accordingly, raised portions 347 may be arranged asymmetricallywith respect to the midline M1 of the connector plate 340 being oneither one half or the other.

In some examples, locking tabs 343 may be formed alone on connectorplates 340 without raised peripheral portions 347. It will further beappreciated than in additional or alternative examples, the laterallocking tabs 343 may instead be formed on the lateral sides of themounting tangs 322 and locking recesses 328 may instead be formed inraised portions 347 on connector plates 340 providing a reverseconstruction. In either construction described herein, these laterallocking features assist with preventing axial withdrawal of the mountingtangs 322 from the connector plates 340 without disassembly of the innerand outer connector plates 340.

The peripheral raised portions 347 and lateral locking tabs 343collectively define a pair of inward facing and opposing bearingsurfaces 342 engaged with mounting tangs 322. The bearing surfaces 342may have a complementary configuration to the peripheral shape of cornermember mounting tangs 322. This in turn further defines a mountingcavity 335 on the inner surface 349 of each connector plate 340 having acomplementary configuration to the perimeter of mounting tangs 322. Themounting tangs 322 substantially fill the cavity 335 when mountedtherein, thereby forming a mating and interlocked keyed fit between theconnector plates 340 and corner members 320.

In one non-limiting example to form an axial interlock feature, theconnector plates 340 may further include locking protrusions 345arranged to engage complementary configured end locking recesses 329formed on the mounting tangs 322. The locking recesses 329 may bedisposed and formed in the free ends 325 of the mounting tangs 322 andface outwards away from body 321 and center point 327. In onearrangement, the locking protrusion 345 may be formed on inner surface349 of connector plate 340 projecting outwards from and perpendicular tothe inner surface in a direction transverse to the axial centerline 348.The locking protrusions 345 may be aligned on the axial centerline 348of the connector plates 340 in one exemplary arrangement as shown. Inother possible arrangements, the locking protrusions may be offset fromthe centerline 348.

Locking protrusions 345 may have a shape (in top plan view of innersurface 349 of connector plate 340) that is configured to help resistaxial withdrawal of the corner member mounting tang 322 in cooperationwith the complementary shape of the end locking recesses 329. In someexamples, locking protrusion 345 may have a non-rectilinear polygonalshape. In one example, the locking protrusions 345 and locking recesses329 may have a trapezoidal shape. In addition to preventing axial andsliding withdrawal of a mounting tang 322 from the connector plate 340,the locking protrusions 345 help maintain the mounting tangs in properposition on a first connector plate until the second connector plate maybe mounted thereto using fasteners 352 as described herein. This keepsmounting holes 346 and 334 in concentric alignment to permit insertionof the fasteners through the mounting tangs 322 and both connectorplates.

The connector plates 340 may extend between and be operable tomechanically couple a spaced apart pair of corner members 320 togetheron the frame 301. In one possible arrangement, a pair of connectorplates 340 may be mounted back-to-back with the foregoing interlockfeatures described herein on each connector facing inwards towards eachother for linking the pair of corner members together. In oneconfiguration, one of the connector plates 340 may be arranged oppositeto and inverted 180 degrees in longitudinal orientation to its matingconnector on the opposite side of corner member mounting tang 322. Inthese foregoing positions, therefore, one each of the connector plates340 may be placed on opposite sides of the mounting tang 322 of thecorner member 320, thereby trapping the mounting tang between theconnector plates. It should be noted that the locking protrusion 345 onone connector plate 340 will actually be located between the raisedportions 347 of the opposite connector plate 340, and vice-versa. Themounting tangs 322 may be considered to form a male fastening elementand the two assembled connector plates 340 a female fastening elementconfigured to receive the male element at least partially therein.

To secure each connector plate 340 together on the mounting tang 322 ofcorner member 320, one or more fasteners 352 may then be insertedthrough mounting holes 334 and 346 formed in the mounting tangs andconnector plates, respectively. In one arrangement, each connector plate340 includes two mounting holes 346 and each mounting tang 322 includesone mounting hole 334. These holes 334, 346 become concentricallyaligned when the connector plates and tangs are positioned together oneach side of the mounting tang 322. Any suitable fasteners 352 may beused, including as an example without limitation threaded fasteners(e.g. bolts, screws, etc.) with mating nuts for detachable securementthereby allowing the frame to be easily assembled and disassembled. Inone arrangement, two fasteners 352 may be provided for each cornermember mounting tang-connector assembly 322/340. One fastener 352 eachmay be located proximate to each end 350 of the connector plate 340. Inother possible examples, the connector plates 340 may be morepermanently joined together with the mounting tang 322 trapped betweenthem such as with rivets, welding, soldering, etc.

The connector plates 340 may be made of any suitable material havingsufficient strength, stiffness, and thickness to form a substantiallyrigid structural member which resists bending and deflection without theapplication of undue force. In some non-limiting examples, the connectorplates 340 may each be made of metal, such as without limitationaluminum, steel, or other. In one non-limiting exemplary construction,the connector plates 340 may be made of die-cast aluminum. In oneexample, each connector plate 340 may have a thickness ranging fromabout and including 0.125 inches to 0.625 inches. In one example,without limitation, the thickness may be about 0.25 inches. Connectorplates 340 may be made by any suitable fabrication process orcombination of processes, including for example without limitationdie-stamping, bending, casting, forging, machining, milling, drilling,etc.

In one configuration, the outer surface 348 of the connector plates 340may include an anti-rotation element 353 which cooperates with anaccessory clip 354 attachable to the plate. Referring to FIG. 65, theanti-rotation element 353 may be a rectilinear recess 359 in oneconfiguration which engages a mating rectilinear mounting protrusion 355formed on the clip 354 to prevent rotation of the clip with respect tothe connector plate 340. The clip protrusion 355 engages the wallsformed around the recess to prevent twisting of the clip. The recess 359may be disposed and formed around the mounting holes 346 on theconnector plate 340 such that the holes extend through plate into therecess. In one exemplary configuration therefore, the accessory clips354 may detachably retained on the connector plates 340 by the samefastener 352 used to secure the plates to the mounting tangs 322 of thecorner members 320 via a through holes 357 formed in the clip.

In one possible configuration, the accessory clip 354 may include a pairof lateral extensions 358 each containing attachment apertures 356 ofany suitable shape configured to engage a mounting feature of theaccessory (e.g. straps, clips, fasteners, etc.). The lateral extensions358 may be oriented 180 degrees apart and project laterally in opposingdirections from the clip mounting protrusion 355 and fastener 352 in onearrangement. The accessory clip 354 may be formed of metal such asaluminum, steel, titanium, etc. as some non-limiting examples forstrength. It will be appreciated that the accessory clips 354 andattachment apertures 356 may have numerous possible configurations andshapes depending the design of the accessory to be attached.

The corner members 320 and connector plates 340 advantageously allow alight-weight generator frame to be shipped in an unassembled “knockdown” condition to reduce packaging size requirements and shippingcosts. The frame may then be assembled at the final destination whichmay be a point of sale, job site, or other. In addition, the modularframe system disclosed herein provides the opportunity to customize theframe and generator system in various ways to meet the end user'spreferences.

An exemplary method for assembling a generator frame will now bedescribed. The method may begin by providing a kit including a pluralityof corner members 320 each having three mounting tangs 322, connectorplates 340, and fasteners such as threaded fasteners 352. Two cornermembers 320 and two connector plates 340 may first be selected from thekit, or alternatively may be selected separately later during theassembly process. A mounting tang 322 of a first corner member 320 maybe positioned on and abuttingly engaged with the inner surface 349 of afirst connector plate 340. More particularly, the mounting tang 322 maybe positioned and inserted into the complementary configured mountingcavity 335 of the selected first connector plate 340. The firstconnector plate 340 may be located on a flat work surface to facilitateassembly.

A mounting tang 322 of a second corner member 320 may then be positionedon and abuttingly engaged with the inner surface 349 of the firstconnector plate 340 opposite the half having the mounting cavity 335 andmounting tang 322 of the first corner member 320 already in position.The locking protrusion 345 of the first connector plate 340 may beinserted into the end locking recess 329 in the mounting tang 322 of thesecond corner member 320 during placement of the tang.

With mounting tangs 322 of the first and second corner members 320positioned on the first connector plate 340, the second connector plate340 is selected and positioned over the first connector with the innersurface 349 facing the inner surface 349 of the first connector. Thesecond connector is rotated and inverted in orientation with respect tothe first connector so that the mounting cavity 335 lies on an oppositehalf of the second connector than on the first connector. Whilemaintaining this position, the second connector plate 340 is placedagainst the mounting tangs 322 of both the first and second cornermembers 320 already engaged with the first connector plate 340 asdescribed above. The mounting tang 322 of the second corner member 320may be positioned on and abuttingly engaged with the inner surface 349of the second connector plate 340. More particularly, the mounting tang322 may be positioned and inserted into the complementary configuredmounting cavity 335 of the second connector plate 340.

The mounting tang 322 of a first corner member 320 (already inserted inthe mounting cavity 335 of the first connector plate 340) may bepositioned on and abuttingly engaged with the inner surface 349 of thesecond connector plate 340 opposite the half having the mounting cavity335. The locking protrusion 345 of the second connector plate 340(facing inwards) may be inserted into the end locking recess 329 in themounting tang 322 of the first corner member 320 during placement of thetang. The mounting tangs 322 of the first and second corner members 320are now clamped and trapped between the first and second connectorplates 340 positioned on opposite sides or faces of the mounting tangs.To complete the connection, a fastener 352 is inserted through each ofthe two mounting holes 342 in the first and second connector plates 340and through the mounting holes 334 of the first and second corner membermounting tangs 322 and secured with a threaded nut. The first and secondcorner members 320 are now mechanically coupled together.

To complete assembly of a full generator frame 301, additional cornermembers 320 are then mechanically connector to each of the remaining twomounting tangs 322 of the first and second corner members in a similarmanner to that described above. The foregoing process is repeated untila total of eight corner members 320 are interconnected using additionalconnector plates 340 and fasteners 352. The completed and assembledframe is shown for example in FIG. 41-50 depicting the completed frameonly (without engine and appurtenances) for clarity.

It will be appreciated that generator frame 301 may partially assembledduring the assembly process to provide greater access for mountingindividual components thereon. For example, the bottom half of thegenerator frame 301 may be assembled and then the motor mounted on themotor support. The top half of the generator frame 301 may be assembledseparately and then the permanent fuel tank 360, control panel 400, etc.can be mounted. The bottom and top halves may then be joined togethervia the four vertical connector plates 340. Numerous assembly variationsare possible to maximize access and speed for assembling the completegenerator. Advantageously, an assembled generator frame may be readilydismantled partially or completely to replace engine or othercomponents, or to add accessories by simply removing fasteners 352 fromthe appropriate connector plates 340.

Referring to FIGS. 67-82, the permanent fuel tank 360 includes a top361, bottom 362, lateral sides 363 extending between the top and bottom,and corners 367 extending between adjacent sides. The upper portions oflateral sides 363 may be downwardly sloping or angled in oneconfiguration to complement the orientation of the connector plate 340assemblies disposed laterally adjacent to the sides in the generatorframe 301. In some configurations, adjoining lower portions of lateralsides 363 below the sloped upper portion may be vertically oriented.Corners 367 extend between adjacent lateral sides 363 and may beconfigured to complement the orientation of corner members 320 disposedlaterally adjacent to the fuel tank corners 367 in the generator frame301. Corners 367 may be may be arranged on a diagonal (i.e. angledbetween 0 and 90 degrees) with respect to the adjacent lateral sides363. In one configuration, fuel tank corners 367 may be downwardlysloping or angled defining an outward and upward facing flat diagonalsurface 368. Fuel tank 360 may have a shape selected to maximizevolumetric storage capacity while conforming at least part to theangular or sloping shaped parts of the generator frame 301 where thefuel tank is mounted. In one non-limiting configuration, fuel tank 360may have an octagonal shape in top plan view. Other suitable shapes maybe used.

The permanent fuel tank 360 may further include a fill spout 373disposed on one of the four corners 367 and a removable closure cap 374.Cap 374 may be configured to threadably engage the spout 373 which maybe externally threaded.

In one configuration, fuel tank 360 may include a recessed well 364formed in the top 361 of the fuel tank for removable storage of aportable fuel tank 380. The well 362 may be complementary configuredwith the shape of the portable fuel tank 380 (in top plan view) to forma nested fuel tank arrangement. The portable fuel tank 380 andcooperative mounting with permanent fuel tank 360 is further describedherein.

Fuel tank 360 may be made of any suitable material approved for thestorage of liquid fuel. In example, the fuel tank 360 may be made of afuel-grade molded plastic material. Other suitable materials includingmetal may be used.

Fuel tank 360 may be mounted to any suitable part of generator frame310. In one arrangement, the fuel tank 360 may be mounted near the top303 of generator frame 301 and extends horizontally across the framebetween all four lateral sides 302 substantially filling the upper thirdof the interior space 305 of the frame. The fuel tank 360 may extendfrom a location inside of and proximate to each of the four horizontalconnector plates 340 that form the top half of the generator frame 301.In one arrangement, the top 361 of fuel tank 360 may be flush with orslightly recessed below the top 303 of the generator frame 301 forprotection. Accordingly, the fuel tank 360 may not protrudesubstantially above generator frame 301, if at all in someconfigurations.

In one arrangement, permanent fuel tank 360 may be mounted to andsuspended from generator frame 301 at the corner locations of thegenerator frame 301, and more particularly near the top portions of thecorners 306 at top corner members 320. The flat diagonal surface 368 atcorners 367 may include a mounting element 371 comprised of a threadedrecess 369 and centrally-located cylindrical protrusion 370 disposedtherein. Recess 369 and protrusion 370 may each be circular in oneconfiguration. A circular depression 372 may be formed in corner 367around recess 369 in some configurations, for reasons describedelsewhere herein.

To mount the permanent fuel tank 360, a fuel tank mounting assemblycomprised of a corner cap 430 and fuel tank fastener 420 may beprovided. Referring to FIGS. 89-102, the corner cap 430 of the assemblymay have a generally truncated triangular shaped body comprising threeradially extending wings 440 to complement the shape of corner members420 to which the cap may be attached. The wings 440 may further beslightly arcuately shaped in an inwards direction to complement thecontour of the corner members 320 to which they are mounted. Corner cap430 includes an outer surface 431, opposing inner surface 432, lateralsides 437, raised plateau protuberance 434 disposed on the innersurface, and a centrally located through hole 433. In one configuration,protuberance 434 has a peripheral shape selected to complement theperipheral shape of central opening 323 and is insertable into theopening for securing the corner cap 430 to the corner member 320.Protuberance 434 and central opening 323 may therefore have a generallytriangular shape. The protuberance 434 prevents the cap 430 fromrotating with respect to corner member 320 via mutual engagement betweenthe polygonal-shaped sides of the protuberance with mating surfacessurrounding the central opening 323 of the corner member. The hole 433may be configured to insert the shank of fastener 420 therethrough forengaging a mounting element 371 on fuel tank 360, as further describedherein. A diametrically enlarged and inwardly protruding boss 433 may beformed around the hole 433 on the raised plateau-shaped protuberance 434which may be configured for insertion into the depression 372 formed onthe fuel tank corners 367. The interaction and engagement of the boss433 with depression 372 helps align and center the corner cap 430 on thecorner member 320 to align hole 433 with threaded recess 369 tofacilitate proper insertion of fastener 420.

The fuel tank fastener 420 may include a head 421 and threaded shank422. In one configuration, shank 422 may be generally cylindrical inshape having one end 423 adjoining head 421 and a substantially flatterminal end 424 to preclude the possibility of puncturing fuel tank360. In one arrangement, terminal end 424 may include an open circularsocket 425 configured for receiving cylindrical protrusion 370 of thefuel tank mounting element 371 when the tank is mounted to the generatorframe 301. It will be appreciated that in alternative examples, bothsocket 425 and protrusion 370 may be omitted wherein the threaded shankis solid and engages mating threaded recess 369 on the fuel tank 360.

The exposed outer surface 426 of head 421 may include an operatingfeature 428 configured for engaging a mutually configured working end ofa tool or key used to rotate the fuel tank fastener 420. Any suitablyshaped operating feature 428 and tool may be used.

The process for mounting the permanent fuel tank 360 to generator frame301 will now be briefly described. In one example, without limitation,the fuel tank 360 may be mounted to the generator frame 301 usingmounting element 371 at three corner members 320 to prevent twisting ofthe tank with respect to the generator frame. It will be noted that theremaining corner member 420 includes provisions for the fuel tank spout373 and cap 374. Fuel tank 360 is positioned inside the top 303 of frame301, as shown for example in FIG. 74. At one corner, the corner cap 430may be positioned on the corner member 320 to insert protuberance 434into central opening 323 of the corner member. Boss 433 on the inside ofcap 430 is inserted into depression 368 on the fuel tank 360. Hole 433in cap 430 is concentrically aligned with threaded recess 369 on fueltank 360. Fuel tank fastener 420 is inserted through corner cap 430(i.e. hole 433) and rotated to engage threaded shank 422 with matingthreaded recess 369 on the fuel tank. The fastener 420 is rotated andtightened which draws the tank 360 and cap 430 together along thecenterline axis of the fastener shank 422 with the corner member 320being interspersed in between. The cap 430 is compressed against theouter surface of the corner member 420 between the head 421 of fastener420 and corner member and the fuel tank corner 367 on the interior ofthe generator frame 301. In one configuration, without limitation, theouter surface 431 of the corner cap 430 may include a recess 438 formedaround hole 433 and the fastener head 421 may be seated in the recessand substantially flush with the outer surface 431. In otherconfigurations, the fastener head 421 may protrude above the outersurface 431 of the corner cap 430 either with or without a recess 438 ifprovided.

In one example, corner cap 430 and fuel tank fastener 420 may be formedof a suitable strength plastic material in addition to the fuel tank 360and corner mounting elements 371. Accordingly, a metal-free fuel tankmounting system may therefore be provided. This arrangementadvantageously reduces weight and minimizes or eliminates interaction ofthe plastic fuel tank with metal edges to reduce wear or puncture of thetank.

Referring to FIGS. 41, 42, 46, and 48, the corner cap 430 associatedwith the fill spout 373 and closure cap 374 of the permanent fuel tank360 may include a diametrically enlarged circular fill spout opening 439configured to receive the fill spout. The fill spout 373 may projectoutwards through the opening 439 and the closure cap 374 is attached tothe fill spout 373 at the exterior of the corner cap 374. In oneconfiguration, the fill spout 373 may be configured to engage and retainthe corner cap 430 in position on the generator frame 301. In onenon-limiting example, the fill spout 373 may include secondary externalthreading to attach the corner cap 430. It will be appreciated that thefuel spout corner cap 430 may be configured similarly to the corner caps430 described above associated with mounting the permanent fuel tank 360with exception of the larger central fill spout opening 439 in lieu ofthe smaller fastener hole 433 and boss 435.

According to another aspect of the generator 398, a removable portablefuel tank may optionally be provided that is configured for detachablemounting in the modular generator frame system 300. The portable fueltank 380 advantageously extends the volumetric capacity and runtime ofgenerator 398. The fuel tank 380 may be configured for detachablecoupling to the generator 398 so that the fuel tank 380 may bedismounted and removed without undoing fasteners or other mechanicalcoupling devices. This allows rapid change-out of portable fuel tanks inthe modular generator frame system 300. In one configuration, asdescribed below, the portable fuel tank 380 may be configured formounting directly to and is supported by the permanent fuel tank 360.

Referring to FIGS. 83-88, the portable fuel tank 380 includes a top 381,bottom 382, lateral sides 383 extending between the top and bottom, andcorners 384 extending between adjacent sides. In one configuration, thesides 383 may be substantially flat. Corners 384 may be may be arrangedon a diagonal (i.e. angled between 0 and 90 degrees) with respect to theadjacent lateral sides 383 defining a flat diagonal surface 392. Fueltank 380 may further include a compact handle 385 formed integrally withthe body of the tank. In one example, a lateral portion of the handlemay form one of the four lateral sides 383 of the fuel tank and anangled portion may form at least in part one of the corners 384. Thisarrangement provides a handle without substantially altering theoctagonal configuration or size of the fuel tank 380.

The removable portable fuel tank 380 may further include a fill spout386 for refilling the tank and a closure cap 387 threadably engaged withthe spout. In one configuration, the fill spout 386 may be disposed onone of the four corners 384 of the fuel tank 380. The corner 384 havingthe fill spout 386 may be configured and dimensioned such that the fillspout and cap 387 when in place do not extend laterally beyond eitheradjacent lateral side 383 to maintain a substantially uniform perimeterdimension and profile for insertion into the well 364 of the permanentfuel tank 360.

Portable removable fuel tank 380 may further include a fluid coupling391 allowing the tank to be fluidly connected to the permanent fuel tank360. Advantageously, the provides the permanent fuel tank 360 with twopotential refueling connections and options. In one configuration, thefluid coupling may include an assembly comprising a tubular outletnozzle 389 fluidly connected to a one-way valve 388. Valve 388 may beconfigured to allow liquid fuel to flow outwards from the portable fueltank 380 to permanent fuel tank 360, but not to re-enter in a reversedirection back through the nozzle 389. The nozzle 389 and valve 389 maybe disposed in the bottom surface on the bottom 383 of the portable fueltank 380. In one arrangement, nozzle 389 may be located in the geometriccenter of the portable fuel tank 380. To protect the nozzle 389 fromdamage during transport and refilling, the nozzle may be disposed in arecess 390 formed in the bottom 383 of the fuel tank 380. Nozzle 389 maytherefore be configured to not protrude above the bottom surface on thebottom 382 of the fuel tank 380. The recess 390 may be circular in shapein one non-limiting configuration; however, other shapes may be used.Nozzle 389 and valve 388 may be formed of plastic in one construction ora combination of plastic and metal.

The outlet nozzle 389 of portable fuel tank 380 may be configured andoperable to engage a mating fluid coupling 365 formed in the top 361 ofthe permanent fuel tank 360 to place the two tanks in fluidcommunication for transferring fuel from the portable tank to thepermanent tank. In one configuration, fluid coupling 365 may comprise araised tubular inlet coupling 366 which projects upwards from therecessed flat surface portion of the top 361 of fuel tank 360 inside thewell 364. Coupling 366 may be tubular shape. The coupling 366 and outletnozzle 389 of the portable fuel tank 380 may be cooperatively configuredand arranged so that the nozzle 389 may be inserted into the coupling.Accordingly, the inlet sleeve 366 may have an internal diameter sizedslightly larger than the outer diameter of the outlet nozzle 389. In oneconfiguration, outlet nozzle 389 and inlet sleeve 366 are cooperativelyconfigured to allow the nozzle to be axially and slidably inserted intothe sleeve. In operation accordingly, the portable fuel tank 380 may beaxially inserted downwards into the open top well 364 of the permanentfuel tank 360. This motion would slidably insert outlet nozzle 389 intoinlet sleeve 366 thereby fluidly coupling the portable and permanentfuel tanks 380 and 360 together. This allows the contents of portablefuel tank 380 to be transferred via gravity to the permanent fuel tank360. Advantageously, the total volumetric fuel capacity of generator 398is therefore increased by providing one or more portable fuel tanks 380which can be interchanged.

The portable fuel tank 380 may have a volumetric capacity of at least10% of the permanent fuel tank 360. For example, in one representativenon-limiting example, the permanent fuel tank 360 may have a capacity ofabout 11 gallons and the removable portable fuel tank 380 may have acapacity of about 2 gallons. Any suitable permanent and portable fueltank capacities may be used.

Referring to FIGS. 36 and 40, the generator control panel 400 mayinclude an emergency stop push button 401 which functions as a singlereadily accessible kill switch to stop the engine. In one example, thestop button 401 may be generally circular in shape. In one arrangement,the stop button 401 may be disposed in the center of a rotary operatingdial 402 configured and operable to change the operating state of themotor (e.g. fuel, choke, run, start, etc.) to simplify the startingsequence. The push button 401 is actuated by depressing the buttoninwards towards the control panel 400.

Referring to FIGS. 39, 40 and 103, the generator frame 301 may include amotor mount bracket 410 configured for attaching the motor mounts 414 ofengine 311. In one configuration, the motor mount bracket 410 may be anelongated and structurally stiff element formed of a suitable metalhaving two opposing mounting ends 411 configured for attachment toopposing connector plates 340 on the bottom of the generator frame.Bracket 410 may include a center section 412 extending between the ends411 having a substantially horizontal position when attached togenerator frame 301 for positioning and mounting the engine 311 thereon.The center section 412 may include spaced apart mounting holes 413 (e.g.two, four, etc.) configured for receiving threaded motor mounts ofengine 311 therethrough having a matching layout pattern.

The mounting ends 411 of bracket 410 may be configured to engage theconnector plates 340 and the same fasteners 352 used to connect eachpair of connector plates together. Accordingly, in one arrangement theends 411 may each include two attachment holes 415 for engaging bothfasteners 352 of each opposing connector plate assembly. The ends 411may have a substantially flattened shape and be upturned at an angle orslope complementary to the angular or sloped orientation of theconnector plates 340 to which the bracket 410 is attached. The bracket410 may bridge or span between the connector plates 340 without anyinterim supports. In one configuration, the center section 412 of themotor mount bracket 410 may have an elongated opening 416 for weightreduction. The bracket 410 may have any suitable cross-sectionalstructural shape which may be uniform or varied between the mountingends 411. In non-limiting exemplary constructions, the motor mountbracket 410 may be made of aluminum or steel.

Gaseous Fuel Power Generators

FIGS. 104-108 illustrate some non-limiting examples of portablegenerators for producing electric power which may be fueled by one ormore gas canisters or cylinders containing a compressed liquid fuel,which changes to gaseous phase when released from the containers. In onenon-limiting example, the fuel source may be propane. The canisters orcylinders may be interchangeably/replaceable in design or permanentrefillable type gas containers in various examples. The generators shownmay include an engine configured to operate on a gaseous fuel source andinclude all related appurtenances and accessories necessary for a fullyfunctional generator system (e.g. alternator, electrical system,pressure regulators, relief valves, controls, electrical outlets, etc.).

FIG. 104 depicts a non-limiting example of a portable generatorconfigured in the form of a backpack. In one configuration, withoutlimitation, the backpack generator 500 may be fueled by one or more gasreplaceable gas canisters 502. The canisters 502 may be standard 16ounce propane canisters in one example. The external housing 504 of thebackpack generator may be formed at least in part from a soft covermaterial in one configuration made from NFPA rated fire resistantmaterials (e.g. fabric, etc.), and may have any suitable shape. In someconstructions, the housing 504 may be formed from hard materials such asplastic or a combination of soft and hard materials. The backpackgenerator 500 may include two padded shoulder straps 506, one or moreelectrical outlets 508, engine 510 configured and designed to operate ongaseous fuel, alternator 511, pressure regulators 512, recoil manualstart mechanism 514, and other appurtenances and accessories for a fullyfunctional generator system.

FIGS. 105-108 depict various non-limiting examples of “suitcase” stylecompact portable generators 520 fueled by one or more gas canisters orcylinders containing a compressed liquid fuel such as propane. Multiplegas canisters 502 or larger cylinders 522 can be used to extend the runtime of the generators. The gas canisters 502 may be standard 16 ouncereplaceable propane canisters. In one non-limiting example shown in FIG.107, a single larger replaceable or permanent refillable gas cylinder522 (e.g. 5 pound or other) may be used. The gas canisters 502 orcylinder(s) 522 may be partially or completed contained in an outer case524 which may include a carrying handle 526 in some examples. One ormore pressure regulators 512 may be provided for each generator. Thegenerator 520 shown in FIG. 106 may include a gas-fueled foldingpivotable cooking range 521 which can be deployed to provide the abilityto both cook with gas and produce electric power. The range 521 may befueled by the gas canister(s) 502 or cylinder(s) 522.

The compact generators 520 each include an engine (not shown) configuredto operate on gaseous fuel which may be mounted inside the outer case524. The engine may be similar to the engine 510 shown in FIG. 104 ordifferent.

In various configurations of the liquid or gaseous fueled generatorsdisclosed herein, it will be appreciated that the power generation unitsmay be configured as either a conventional generator (i.e. drawing ACelectric power directly off the wire coil) or an inverter generator(i.e. transforming electric power off the coil into DC power and thenback into AC).

While the foregoing description and drawings represent some examplesystems, it will be understood that various additions, modifications andsubstitutions may be made therein without departing from the spirit andscope and range of equivalents of the accompanying claims. Inparticular, it will be clear to those skilled in the art that thepresent invention may be embodied in other forms, structures,arrangements, proportions, sizes, and with other elements, materials,and components, without departing from the spirit or essentialcharacteristics thereof. In addition, numerous variations in themethods/processes. One skilled in the art will further appreciate thatthe invention may be used with many modifications of structure,arrangement, proportions, sizes, materials, and components andotherwise, used in the practice of the invention, which are particularlyadapted to specific environments and operative requirements withoutdeparting from the principles of the present invention. The presentlydisclosed examples are therefore to be considered in all respects asillustrative and not restrictive, the scope of the invention beingdefined by the appended claims and equivalents thereof, and not limitedto the foregoing description or examples. Rather, the appended claimsshould be construed broadly, to include other variants and examples ofthe invention, which may be made by those skilled in the art withoutdeparting from the scope and range of equivalents of the invention.

What is claimed is:
 1. A modular portable generator frame system, thesystem comprising: an open space frame including a top, opposing bottom,a plurality of horizontally extending top and bottom lateral elementscircumscribing the top and bottom of the frame respectively, andvertically extending corner elements coupled between the top and bottomlateral elements; an open interior space defined by the frame; aplurality of corner members each comprising a central body and pluralityof elongated radially extending mounting tangs extending outwards fromthe central body and having a first set of locking features; a pluralityof connector plates each comprising a second set of locking featurescomplementary configured with the first set of locking features to forman interlocked keyed fit; wherein each of the top and bottom lateralelements and vertically extending corner elements are formed by aninterlocked assembly of a pair of connector plates which lockinglyreceive therebetween one of the mounting tangs from each of two opposingcorner members.
 2. The system according to claim 1, wherein eachmounting tang includes a mounting hole concentrically aligned with amating mounting hole in each connector plate of the assembly whichreceives a removable fastener therethrough which secures the assemblytogether.
 3. The system according to claim 1, wherein the connectorplates each include a pair of opposing locking tabs engaged withcomplementary configured lateral locking recesses formed in eachmounting tang of the corner members to form an interlocked fit whichcannot be axially separated when assembled.
 4. The system according toclaim 3, wherein the locking tabs protrude inwardly towards each otherand the lateral locking recesses each face outwardly to receive one ofthe locking tabs.
 5. The system according to claim 3, wherein theconnector plates each further include a locking protrusion engaged witha complementary configured end locking recess formed on a distal freeend of each mounting tang.
 6. The system according to claim 5, whereinthe end locking recess opens radially outwards, the end locking recessand locking protrusion each having complementary mating non-rectilinearpolygonal shapes to form an interlocked fit which cannot be axiallyseparated when assembled.
 7. The system according to claim 1, whereinthe corner members have a triad of radially extending mounting tangsspaced equally angularly apart.
 8. The system according to claim 7,wherein the mounting tangs are each disposed at an oblique angle to thecentral body of the corner members.
 9. The system according to claim 1,wherein the central body of the corner members have a central openinghaving a polygonal shape defined by a short segment defined by themounting tangs and a long segment connecting the mounting tangstogether.
 10. The system according to claim 9, further comprising acorner cap including a raised plateau protuberance on an inner surfacewhich has a complementary polygonal shape to the central opening and amounting hole, the protuberance insertable through the central openingto secure the corner cap to the corner member.
 11. The system accordingto claim 9, further comprising an annular shaped fuel tank configuredfor mounted to the frame inside the top lateral elements.
 12. The systemaccording to claim 11, wherein the fuel tank includes a plurality ofcorners having a threaded recess which receives a mating threadedfastener inserted through the mounting holes in the corner caps tosecure the fuel tank to the corner members of the frame.
 13. The systemaccording to claim 1, wherein the mounting tangs from the two opposingcorner members are arranged in proximate end-to-end relationship betweenthe pair of connector plates in the locking assembly.
 14. The systemaccording to claim 11, wherein the fuel tank includes an upwardly openwell and a removable portable fuel tank inserted in the well.
 15. Thesystem according to claim 1, further comprising an engine mounted in theinterior space of the frame.
 16. A kit for assembling a portablegenerator frame, the kit comprising: a plurality of corner members eachincluding a central body and plurality of elongated radially extendingmounting tangs extending outwards from the central body and each havinga first set of keyed locking features, the mounting tangs spacedangularly apart from each other and including a mounting hole; aplurality of connector plates each including a second set of matingkeyed locking features complementary configured with the first set ofkeyed locking features to form an interlocked keyed fit when assembled,the connector plates each including a pair of mounting holes; aplurality of fasteners configured for insertion through the mountingholes of the corner members and connector plates when assembled; whereina portion of the generator frame is constructible by an interlockedassembly comprising a pair of connector plates in face-to-facerelationship which lockingly receive therebetween one of the mountingtangs from each of two opposing corner members and two of the fastenerssecured through the connector plates and corner members, the keyedlocking features of the corner members arranged to mutually engage withthe keyed locking features of connector plates, the fasteners.
 17. Thekit according to claim 16, wherein the second set of keyed lockingfeatures of each connector plate includes a pair of opposing lockingtabs arranged to engage complementary configured lateral lockingrecesses formed in each mounting tang of the corner members to form aninterlocked fit which cannot be axially separated when assembled. 18.The kit according to claim 17, wherein the second set of keyed lockingfeatures of each connector plate further include a locking protrusionarranged to engage complementary configured end locking recess formed ona distal free end of each mounting tang when assembled.
 19. The kitaccording to claim 18, wherein the mounting tangs of the two opposingcorner members are arranged in end-to-end abutting relationship whenassembled.
 20. A method for assembling a portable generator frame, themethod comprising: providing a plurality of connector plates eachincluding a pair of opposing locking tabs, a locking protrusion, and apair of mounting holes; providing a plurality of corner members eachincluding a central body and plurality of elongated radially extendingmounting tangs extending outwards from the central body, the mountingtangs spaced angularly apart from each other and each including amounting hole, an end recess, and a pair of opposing lateral recesses;engaging the locking tabs of a first one of the connector plates withthe lateral recesses of a first one of the mounting tangs of a first oneof the corner members; engaging the end recess of a first one of themounting tangs of a second one of the corner members with the lockingprotrusion of the first one of connector plates; positioning a secondone of the connector plates on top of the first one of the connectorplates and the first ones of the mounting tangs of the first and secondones of the corner members; engaging the end recess of the first one ofthe mounting tangs of the first one of the corner members with thelocking protrusion of the second one of the connector plates; engagingthe locking tabs of the second one of the connector plates with thelateral recesses of the first one of the mounting tangs of the secondone of the corner members; inserting a first fastener through themounting hole of the first one of the mounting tangs of the first one ofthe corner members and a first one of the mounting holes of the firstand second connector plates; and inserting a second fastener through themounting hole of the second one of the mounting tangs of the second oneof the corner members and a second one of the mounting holes of thefirst and second connector plates.